Australia's Museum of Old and New Art is renowned for its unique design, eccentric founder and provocative art. But at the centre of it all, MONA's greatest achievement has been in the technological realm.

Think your all-aluminum HTC One smartphone is really posh? Think again. HTC's 24-karat gold-plated version of the One takes exclusivity to new heights. The company made only two of these special handsets, which would cost $2,500 apiece if they were ever sold to mere mortals.